build: add options to compile with address/undefined sanitizers

This adds two new options to the configure scripts to compile NM,
clients and libraries with the address and undefined-behavior
sanitizers available in recent GCC versions. Clang is not supported at
moment.

configure.ac

@@ -972,6 +972,39 @@ if (test "${enable_ld_gc}" != "no"); then
 	fi
 fi
 
+AC_ARG_ENABLE(address-sanitizer, AS_HELP_STRING([--enable-address-sanitizer],
+	[Compile with address sanitizer (default: no)]))
+if (test "${enable_address_sanitizer}" = "yes"); then
+	CC_CHECK_FLAGS_APPEND([asan_cflags], [CFLAGS], [-fsanitize=address])
+	AS_IF([test -z "$asan_cflags"],
+		[AC_MSG_ERROR([*** -fsanitize=address is not supported])])
+
+	sanitizer_cflags="$sanitizer_cflags -fsanitize=address"
+	sanitizer_ldflags="$sanitizer_ldflags -Wc,-fsanitize=address"
+	sanitizers="${sanitizers}asan "
+fi
+
+AC_ARG_ENABLE(undefined-sanitizer, AS_HELP_STRING([--enable-undefined-sanitizer],
+	[Compile with undefined behavior sanitizer (default: no)]))
+if (test "${enable_undefined_sanitizer}" = "yes"); then
+	CC_CHECK_FLAGS_APPEND([ubsan_cflags], [CFLAGS], [-fsanitize=undefined])
+	AS_IF([test -z "$ubsan_cflags"],
+		[AC_MSG_ERROR([*** -fsanitize=undefined is not supported])])
+
+	sanitizer_cflags="$sanitizer_cflags -fsanitize=undefined"
+	sanitizer_ldflags="$sanitizer_ldflags -Wc,-fsanitize=undefined"
+	sanitizers="${sanitizers}ubsan "
+fi
+
+if test -n "$sanitizers"; then
+	CFLAGS="$CFLAGS $sanitizer_cflags -DVALGRIND=1 -fno-omit-frame-pointer"
+	LDFLAGS="$LDFLAGS $sanitizer_ldflags"
+	sanitizers="${sanitizers% }"
+	AC_SUBST(SANITIZER_ENV, [ASAN_OPTIONS=detect_leaks=0])
+fi
+
+AC_SUBST(SANITIZERS, [$sanitizers])
+
 dnl -------------------------
 dnl Vala bindings
 dnl -------------------------
@@ -1068,7 +1101,6 @@ fi
 AM_CONDITIONAL(BUILD_SETTING_DOCS, test "$build_setting_docs" = "yes")
 AM_CONDITIONAL(SETTING_DOCS_AVAILABLE, test "$build_setting_docs" = "yes" -o "$have_setting_docs" = "yes")
 
-
 AC_CONFIG_FILES([
 Makefile
 shared/Makefile
@@ -1233,4 +1265,5 @@ echo "  code coverage: $enable_code_coverage"
 echo "  LTO: $enable_lto"
 echo "  linker garbage collection: $enable_ld_gc"
 echo "  JSON validation: $enable_json_validation"
+echo "  sanitizers: $sanitizers"
 echo

contrib/fedora/rpm/NetworkManager.spec

@@ -375,6 +375,8 @@ intltoolize --automake --copy --force
 %if %{with debug}
 	--with-more-logging \
 	--with-more-asserts=10000 \
+	--enable-address-sanitizer \
+	--enable-undefined-sanitizer \
 %endif
 	--enable-ppp=yes \
 	--with-libaudit=yes-disabled-by-default \

libnm-glib/Makefile.am

@@ -196,6 +196,10 @@ CLEANFILES = $(BUILT_SOURCES)
 INTROSPECTION_GIRS =
 INTROSPECTION_COMPILER_ARGS = --includedir=$(top_builddir)/libnm-util
 
+# Pass SANITIZER_ENV where a command that uses built libraries is
+# executed, to suppress possible errors
+INTROSPECTION_SCANNER_ENV = $(SANITIZER_ENV)
+
 if HAVE_INTROSPECTION
 introspection_sources = $(libnminclude_HEADERS) $(libnm_glib_la_csources)
 

libnm-util/Makefile.am

@@ -169,6 +169,10 @@ INTROSPECTION_GIRS =
 INTROSPECTION_SCANNER_ARGS = --add-include-path=$(srcdir)
 INTROSPECTION_COMPILER_ARGS = --includedir=$(srcdir)
 
+# Pass SANITIZER_ENV where a command that uses built libraries is
+# executed, to suppress possible errors
+INTROSPECTION_SCANNER_ENV = $(SANITIZER_ENV)
+
 if HAVE_INTROSPECTION
 introspection_sources = $(libnm_util_include_HEADERS) $(nodist_libnm_util_include_HEADERS) $(libnm_util_la_csources)
 

libnm/Makefile.am

@@ -141,12 +141,10 @@ libnm_la_LIBADD = \
 	$(UUID_LIBS) \
 	$(GUDEV_LIBS)
 
-libnm_la_LDFLAGS = \
-	$(CODE_COVERAGE_LDFLAGS)
-
 SYMBOL_VIS_FILE=$(srcdir)/libnm.ver
 
 libnm_la_LDFLAGS = -Wl,--version-script=$(SYMBOL_VIS_FILE) \
+	$(CODE_COVERAGE_LDFLAGS) \
 	-version-info "1:0:1"
 
 ###
@@ -170,6 +168,10 @@ INTROSPECTION_COMPILER_ARGS =			\
 	--includedir=$(top_srcdir)/libnm	\
 	--includedir=$(top_builddir)/libnm
 
+# Pass SANITIZER_ENV where a command that uses built libraries is
+# executed, to suppress possible errors
+INTROSPECTION_SCANNER_ENV = $(SANITIZER_ENV)
+
 if HAVE_INTROSPECTION
 introspection_sources =				\
 	$(libnm_core_headers)			\
@@ -213,9 +215,16 @@ docs_sources = $(filter-out %/nm-core-enum-types.c,$(libnm_core_sources))
 nm-setting-docs-overrides.xml: generate-plugin-docs.pl $(docs_sources)
 	$(srcdir)/generate-plugin-docs.pl dbus $(top_srcdir)/libnm-core $@
 
+# When the python scripts loads libnm and the address sanitizers is
+# enabled, we must LD_PRELOAD libasan otherwise it will complain that
+# it was not loaded as initial library.
 nm-property-docs.xml: generate-setting-docs.py $(docs_sources) | NM-1.0.gir NM-1.0.typelib libnm.la
 	export GI_TYPELIB_PATH=$(abs_builddir)$${GI_TYPELIB_PATH:+:$$GI_TYPELIB_PATH}; \
 	export LD_LIBRARY_PATH=$(abs_builddir)/.libs$${LD_LIBRARY_PATH:+:$$LD_LIBRARY_PATH}; \
+	if echo $(CFLAGS) | grep -e -fsanitize=address; then \
+		export LD_PRELOAD="$${LD_PRELOAD} $$(ldd $(abs_builddir)/.libs/libnm.so | grep libasan\.so\.. -o | head -n 1)"; \
+	fi; \
+	[ -n "$(SANITIZER_ENV)" ] && export $(SANITIZER_ENV) ; \
 	$(srcdir)/generate-setting-docs.py \
 		--gir $(builddir)/NM-1.0.gir \
 		--output $@
@@ -223,6 +232,10 @@ nm-property-docs.xml: generate-setting-docs.py $(docs_sources) | NM-1.0.gir NM-1
 nm-setting-docs.xml: generate-setting-docs.py $(docs_sources) nm-setting-docs-overrides.xml | NM-1.0.gir NM-1.0.typelib libnm.la
 	export GI_TYPELIB_PATH=$(abs_builddir)$${GI_TYPELIB_PATH:+:$$GI_TYPELIB_PATH}; \
 	export LD_LIBRARY_PATH=$(abs_builddir)/.libs$${LD_LIBRARY_PATH:+:$$LD_LIBRARY_PATH}; \
+	if echo $(CFLAGS) | grep -e -fsanitize=address; then \
+		export LD_PRELOAD="$${LD_PRELOAD} $$(ldd $(abs_builddir)/.libs/libnm.so | grep libasan\.so\.. -o | head -n 1)"; \
+	fi; \
+	[ -n "$(SANITIZER_ENV)" ] && export $(SANITIZER_ENV) ; \
 	$(srcdir)/generate-setting-docs.py \
 		--gir $(builddir)/NM-1.0.gir \
 		--overrides $(builddir)/nm-setting-docs-overrides.xml \